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Best Whole House Humidifier

In this Appliance Accreditor review, I'll tell you why the Opolar Whole-house Evaporative Humidifier earned our accreditation for the best whole house humidifier.

Opolar Whole-House Evaporative Humidifier is not your ordinary humidifier, as it offers fast humidification for the whole house. It will effectively cover a room space of 800 sq. ft. – 1,000 sq. ft. With a full tank, this humidifier will last around 10-20 hours, enough for a whole day's worth of use. This humidifier is a powerhouse! 

If you're interested in learning more about Opolar Whole-house Evaporative Humidifier, keep reading! We'll also take a look at some of your other options when it comes to selecting the best whole home dehumidifier. Then we'll wrap up this post with some whole house humidifier FAQs so you're well-equipped to get the most out of your new appliance!

Best Whole House Humidifier: Opolar Whole-house Evaporative Humidifier

As its name implies, Opolar Whole-house Evaporative Humidifier will effectively hydrate your house with up to 6 gallons per day that will cover up to 1,000 square feet. With the help of wick filters and a large turbo fan, this humidifier will not produce fog or white dust compared to other humidifiers and there is no leakage risk because of its unique design. This appliance can also conveniently protect your family and loved ones from the common cold. It is a fact that relative humidity levels of 43% or more will reduce the possibility of getting a cold. Opolar Whole-house Evaporative Humidifier will also nurture well-being by soothing a scratchy throat, dry skin and eyes.

If you are worried about impurities and bacteria, then don't worry – the Opolar Whole-house Evaporative Humidifier has antibacterial filters which will cleanse the air before releasing water molecules to increase humidity. With a press of a button, you can select between auto mode, sleep mode, middle mode, and high mode so you can conveniently control how this humidifier will work in your room. One feature that we really love about this humidifier is that it works quietly; the noise that will be generated is less than 50db. Rest assured that you and your loved ones will not be bothered when you are sleeping. This humidifier is highly suitable not only in your living room, but your bedroom and baby room as well. 

One thing that we noticed about Opolar Whole-house Evaporative Humidifier is that it will not automatically stop working after reaching a humidity level. However, it compensates by lowering the fan speed after reaching 60% humidity level. Overall, the ease of use and flexibility of this device helped it earn our pick for the best whole house humidifier.


  • Fast humidification
  • Wide coverage
  • Has antibacterial filters 


  • Does not automatically shut off at a certain humidity

Click here to get your Opolar Whole-house Evaporative Humidifier on Amazon today! 

Runner-Up: Aprilaire 500M Whole Home Humidifier

As a close match, Aprilaire 500M Whole Home Humidifier comes in as our runner-up. This humidifier will have no problem producing humidity since its coverage is up to 3,000 square feet in tightly built homes and at the same time, it has a capacity of 12 gallons per day. You and your loved ones will feel more comfortable. This humidifier will even preserve the items in your house which are susceptible to damage, such as wood floors, cabinets and furnishings that are vulnerable to dry conditions or changing humidity.

One feature that we really like with the Aprilaire 500M Whole Home Humidifier is that it runs efficiently and is perfect for tight spaces, thanks to its compact design. The dimensions are 15.625 W X 13.00 H X 10.25 D. This humidifier won't take too much space while providing you and your loved ones with the comfort and relaxation that you deserve in your home.

The right level of humidity can make all the difference in how comfortable you feel in your house, and the Aprilaire 500M Whole Home Humidifier delivers. Keep in mind that the Aprilaire 500M Whole Home Humidifier requires professional installation as there will be some parts that are not included, and if you don't have a HVAC background, you might need the help of a professional. If this isn't a problem for you, this may be your best whole house humidifier option!


  • 12 gallons per day capacity
  • 3,000 square feet of coverage 
  • Trusted brand 


  • A little bit of difficulty in terms of installation 
  • Manual control

Click here to get your Aprilaire 500M Whole Home Humidifier on Amazon today! 

Premium Option: Aprilaire 800 Whole Home Steam Humidifier

Our premium option is the Aprilaire 800 Whole Home Steam Humidifier, which is ideal for people who have the extra budget to dish out on a well-built and powerful humidifier. This humidifier will accommodate larger houses of up to 6,200 square feet and can put out a maximum of 34.6 gallons of air moisture per day so rest assured that you will be extremely satisfied with this humidifier. If you want a humidifier that will work wonders and flawlessly then Aprilaire 800 Whole Home Steam Humidifier is the perfect fit for you. 

One of the factors that most people look into is the brand, since there's only few reputable brands we can trust. In regards to humidifiers, Aprilaire, the leader in indoor air quality solutions, is a brand you can rely on to deliver what you need. One special feature of the Aprilaire 800 Whole Home Steam Humidifier that we really like is that it is automatic, so you won't need to check it from time to time. This humidifier has dual sensors which will monitor and respond to outdoor temperature and indoor humidity to make sure that it will deliver the optimum humidity all day and night throughout your house. 

Using the Aprilaire 800 Whole Home Steam Humidifier no hassle, just set it and forget it. You will have the peace of mind that no other product will be able to beat, making this one of the best whole house humidifier options out there.


  • 34.6 gallons capacity 
  • Trusted brand
  • Can cover up to 6,200 square feet
  • Automatic


  • Higher price 

Click here to get your Aprilaire 800 Whole Home Steam Humidifier on Amazon today! 

Budget Option: Honeywell Cool Moisture Console Humidifier

The Honeywell Cool Moisture Console Humidifier is our product for our readers who are budget conscious, but at the same time, want a humidifier that will do the job. This compact humidifier has a 3 gallon capacity (two 1.5 gallon water tanks) that can run for 24 hours on low setting. Aside from not breaking the bank, this humidifier features QuietCare technology that provides comfortable humidity at a volume 30% quieter than comparable models. One feature that we really like is that even though it is small, it features auto shut-off which will help control and maintain the proper humidity of your home. 

With Honeywell Cool Moisture Console Humidifier's adjustable humidistat, you can set the humidity level you want and there's three speed settings that will allow you to adjust the moisture output. No need to worry about water impurities, since the Honeywell Cool Moisture Console Humidifier has a wicking filter that effectively removes impurities from water, reducing white dust and providing clean moisture. 

Cleaning and maintaining Honeywell Cool Moisture Console Humidifier is such a breeze since it features a wide-opening top which makes filling and cleaning easy. This humidifier is perfect for homes with babies, children, and adults. It will conveniently diffuse moisture into the air of your bedroom or nursery, making it comfortable. This can have great benefits if you commonly experience dry air, allergies or sickness. The Honeywell Cool Moisture Console Humidifier is available in black and white, so you also have some flexibility in the appearance of your appliance.

We would just like to remind you that this humidifier is light, so it is suited to be placed somewhere that it cannot be knocked off easily. 


  • Ideal anywhere since it is relatively quiet 
  • Adjustable humidity control and multiple output settings
  • Budget friendly


  • 3 gallon capacity might not be enough for some people

Click here to get your Honeywell Cool Moisture Console Humidifier on Amazon today! 

Whole House Humidifier FAQs

Now that you've seen some of the best whole house humidifiers, you're almost ready to get started with using one of these great appliances! If you need some more help determining which humidifier qualities matter most, refer to our guide on fixing low humidity in a home. Or, take a second to review some of these commonly asked questions.

How Does a Whole House Humidifier Work?

Whole home humidifiers are devices that emit steam or water vapor to increase moisture levels in the air. Generally, humidifiers work by generating fresh moisture, water flows from tanks into the water tray then it will be absorbed into the filter. Dry indoor air is quietly drawn through the filter absorbing the moisture while the air washing layer captures dirt, dust, and pollen. Afterwards, the fan disperses fresh, natural moisture into the air. 

Whole house humidifiers are divided into five categories: 

  • Central humidifiers are built into home heating and air conditioning systems and are designed to humidify the whole house
  • Ultrasonic humidifiers produce a cool mist with ultrasonic vibration
  • Impeller humidifiers produce a cool mist with a rotating disk
  • Evaporators use a fan to blow air through a wet wick, filter or belt
  • Steam vaporizers use electricity to create steam that cools before leaving the machine

Opolar Whole-house Evaporative Humidifier is the best example of an evaporator type of humidifier and our personal favorite when it comes to these devices.

How To Install a Whole House Humidifier

There is no simple answer on how to install a whole house humidifier since there are different types. Some humidifiers are installed in the return-air duct while others employ a bypass duct to move heated air through the humidifier and reintroduce it to the air going to the house. Generally, installing either system will involve cutting a hole in the venting using templates provided by the humidifier manufacturer. You will need about two hours to mark the template, cut holes, and install the humidifier. However, make sure to shut off the furnace before you begin. 

These are the tools that you will need:

  • Cordless drill and bit
  • Aviation snips
  • Screwdriver
  • Wire strippers
  • Adjustable wrench

These are the materials you will need:

  • Felt-tip marker
  • Humidifier unit
  • Vent pipe 

Below are the steps in installing a whole house humidifier: 

  • Mark the hole
  • Mark outline of humidistat
  • Install humidistat
  • Connect the humidifier 
  • Run line to the humidifier 
  • (Optional) Install a bypass vent  

What is the Best Whole House Humidifier?

We wish that this question would be easy to answer; however, there is no single answer to this question. The best whole home humidifier varies from person to person depending on your needs, house condition, and home size. Generally, you should look into the features such as gallon size, the effective area, filter quality, noise levels and whether it features automation. Antibacterial properties of the filter can be a great feature, so be on the lookout for this if you are looking to simultaneously clean your air.

With all points taken into consideration, if you need a premium humidifier, nothing beats the value and performance of Aprilaire 800 Whole Home Steam Humidifier. This might very well be one of the best whole home humidifier options on the market.

That'll do it for our review of the Best Whole House Humidifier! If you have any questions about these appliances, leave us a comment below. And for the latest Appliance Accreditor content, be sure to visit our blog.

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  1. Pingback: What Are the Benefits of a Humidifier? | Appliance Accreditor

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